package modeloAux;

/* FixedLengthDocument.java */
import javax.swing.*;
import javax.swing.text.*;

	   
	public class FixedLengthDocument extends PlainDocument
	{
	    private int iMaxLength;
	 
	    public FixedLengthDocument(int maxlen) {
	        super();
	        iMaxLength = maxlen;
	   }
	
	     public void insertString(int offset, String str, AttributeSet attr)
	                     throws BadLocationException    {
	         if (str == null) return;
	 
	         if (iMaxLength <= 0)        // aceitara qualquer no. de caracteres
	         {
	             super.insertString(offset, str, attr);
	             return;
	         }
	 
	         int ilen = (getLength() + str.length());
	         if (ilen <= iMaxLength)    // se o comprimento final for menor...
	            super.insertString(offset, str, attr);   // ...aceita str
	         }
	}